Safety device against explosions in the air-pipes of internal-combustion engines.



c. c. REGENBOGEN & P. A. m. SAFETY DVICE AGAINST EXPLOSIONS IN THE AIRPIPES OF INTERNAL COMBUSTION ENGINES.

APPLICATION FIL ED SEPT. 19/1914.

Patentei Ja11.4, 1916.

connan c. nnennnoenn, or KIELGAARDEN, AND rain. a. BITTER, ceman can.MANY, .ASSIGNORS T FRIED- imuer ax'rrnnonsnmscnarg onanmwnnr'r,

OF KIEL-GAABDEN, GERMANY.

- 'SAFETYQDIEVICE AGAINST ii xrno's rons In mnn Jim-runs ormranconnps'rron I ENGINES.

Specification of Letters Patent. Patented J 1916.

Application filed September 19, 1914, Serial No. 862,618.

i To all whom'z't aaayconce'm:

room: and PAUL A. Rrrrnn, citizens of the Be it known that we, Conn'An ORecen- German Empire, residing at Kiel-Gaarden,

Germany, and Kiel, Germany, have invented certaln new and usefulImprovements 1n.

SafetyDevices Against Explosions in the Ajr-Pipes of Internal-CombustionEngines, of which the followingis a specification.

I Should the pressure of the injection'air, for one reason or another,sink below the end pressure generated in the compression chamber of thecylinder during the opera I tion of internal combustion engines, thefuel 'at the time contained in the nozzle will,ion I the opening of thefuel injection valve, be

sprayed into the'air conduit insteadof in the cylinder. The combustiblemixture generated' therebyymight on accidental ignition'give cause'to anexplosion extremelydangerous to the operators'antl the engine.

In order to prevent such explosion to be transmitted to, the air supplytank, a nonreturn valve with brake disk is provided in the air duct,behVeGl'DfiliItahk and the fuel injecting valve. It'i's',-:however, notpossible in this manner to prevent-' that all the partssituated in frontof the .non' retu'rn valve in the; direction of the cylinder, inparticular the atomizer, the atomizer needle, etc., are

.-dstroyed by the explosion. The object of the present invention is nowto provide a de I 'vice, by means of which the consequences of theexplosion are not lessened as for merly, but which prevents the formingof a combustiblemixture altogether and thereby avoids effectively theoccurrence of an explosion in the air duct.

Two embodlments of the present invention are diagrammaticallyillustrated in the accompanyingdrawings and; Figure :1

shows an elevation of the device partly in section and, Fig. 2, a viewsinularv to Fig.1

of a slightly modified arrangement. I

In Fig. 1 A is the working cylinder of an injection internal combustionengine-and B the fuel injecting valve. To the valve B are attached thefuel intake pipe D leading I from the fuel pump C, and the air injectingso pipe. F

' .preased which is'iconnected 'withia compump (1, its suction pipe Dleads jto the fuel-supply tank E. I

In accordancewith the present invention, a shutting off member H isinserted in this fuel suction pi pe D which member isopened and closedby a'pressureregulator K in cooperation with; a connecting, rod M.

The pressure regulator K is of the usual oonstructlon and consists of a.piston-running-in a cylinder,and with a spring Lacting on one sidethereof, the other side st nding under theinflutihcetif; the pressure omthe injection hir,whi'ch. has admi'ttalnce to the cylinder of thepressure regulator by 'means of a branch pipe F ilrom the pipe F. Thetension of the spring Llbeingso selected, that it is able to expand whenthe pres I i sure of the injection air has: fallen below, that requiredfor injecting the fuelin the working cylinder. f

The opera-tiom of the described device is as follows: Duringsufiiciently high pressurefof the injection air, the ispringL will becompressed by the piston actuated by the pressureiof the injection air,so that the shutting ofi member H is opened as shown bydotted lines,position I, in the drawing,

and the fuel is permitted to pass through the piston of. the pressureregulator to the left, so'thatthe shutting-0ft member sirnul- Itaneously is closed by meansof the connect- As the packing of the pistonin the presingrods'M, see the fulfdrawir position II.

sure regulator is, on account of the high pressure of the injection air,connected with difliculties, a-diaphragm may, for this purpose beutilized instead of this piston.

, The embodiment illustrated in Fig. 2 differs from that in Fig. 1 onlythereby that instead'of the spring L, a gaseous pressure means is used.This is provided in a simple manner, by directly connecting the'right'air receptacle-Q From the fuel hand cylinder-half 'ot the pressurecylind the right end face of the-pressure regulator piston is influencedby the compression pressure. This arrangement has the advantage,

that the piston of theprcssure regulator.

needs to be packed against a small portion of the pressure correspondingto the difference between the compression pressure and the injecting airpressure, that means that this arrangement is much easier to keep tightthan the embodimentillustrated in Fig}. A non-return valve inserted inthe pipe N prevents the transmission of the occurring pressurefluctuations in the working cylinder into the pipe N and causing avibration of the piston of the pressure regulater. The manner of"operation of the arrangement according to Fig. 2' coincides with thatshown in Fig. 1.

Instead of having the shutting-off member ll of the pressure regulator Kpositively connected, it might be so arranged that means'such as aspring or a weighted lever, is provided on the shuttingaiff memberitself for closingit, the pressure regulator releasing only this closingdevice on the lowering of the pressure below a permissible amount in theair injection pipe. .WVe claim: v

1. A safety device against-explosions in the air pipes of internalcombustion engines, comprising means for shutting'oll the fuel supply,directly the pressure in the'air pi pcs sinks below a certain amount,said means having a cylinder of constant volume, a reciprocating membertherein, a normally open valve in the fuel conduit of the engine, saidcylinder and said valve forming separate units, connection between saidmember and said. valve, one end of said cylinder having pipe connectionwith said air pipes, and pressure means for holding said member agains tsaid end of the cylinder,

incense 2. A safety device against explosions in,

the air pipes of internal combustion engines, comprising means forshutting off the fuel supply, directly the pressure in the air pipessinks below a certain amount, said means having a cylinder of constantvolume, a reciprocating member therein, a normally open valve inthe'fuelconduit of the engine, said cylinder and said valve forming separateunits, connection between said member and said valve, one, end of saidcylinder having a pipe connection with said air"pipes,and'

pressure means for holding said member against said end of the cylinder,sald pressure means having a conduit connecting the. compression chamberof the engine wlth the:

opposite end of said cylinder.

3. A safety device against explosions in the air pipes of internalcombustion engines, con'iprising means for shutting ofi'the fuel supply,directly the pressurein the air pipes sinks below a'certain amount,said. means having a cylinder of constant volume, a reciprocatingmemberthereim-a normallyopen valve in thefuel conduit of the engine,said cylinder and said valve. forming separate units, connection betweensaid niembcrand said valve, one end of saidcylinder having a pipeconnection with said air pipes, and pressure means forholding saidmember 11 I i n v e against said end 01 the cylinder, said pressuremeans havinga'conduit connecting the compression chamber of the enginewith the opposlte end of said cylinder and a nonretur'n valve in saidconduit.

